CognitoIdentityProvider / Client / respond_to_auth_challenge

respond_to_auth_challenge#

CognitoIdentityProvider.Client.respond_to_auth_challenge(**kwargs)#

Some API operations in a user pool generate a challenge, like a prompt for an MFA code, for device authentication that bypasses MFA, or for a custom authentication challenge. A RespondToAuthChallenge API request provides the answer to that challenge, like a code or a secure remote password (SRP). The parameters of a response to an authentication challenge vary with the type of challenge.

For more information about custom authentication challenges, see Custom authentication challenge Lambda triggers.

Note

Amazon Cognito doesn’t evaluate Identity and Access Management (IAM) policies in requests for this API operation. For this operation, you can’t use IAM credentials to authorize requests, and you can’t grant IAM permissions in policies. For more information about authorization models in Amazon Cognito, see Using the Amazon Cognito user pools API and user pool endpoints.

Note

This action might generate an SMS text message. Starting June 1, 2021, US telecom carriers require you to register an origination phone number before you can send SMS messages to US phone numbers. If you use SMS text messages in Amazon Cognito, you must register a phone number with Amazon Pinpoint. Amazon Cognito uses the registered number automatically. Otherwise, Amazon Cognito users who must receive SMS messages might not be able to sign up, activate their accounts, or sign in.

If you have never used SMS text messages with Amazon Cognito or any other Amazon Web Services service, Amazon Simple Notification Service might place your account in the SMS sandbox. In sandbox mode , you can send messages only to verified phone numbers. After you test your app while in the sandbox environment, you can move out of the sandbox and into production. For more information, see SMS message settings for Amazon Cognito user pools in the Amazon Cognito Developer Guide.

See also: AWS API Documentation

Request Syntax

response = client.respond_to_auth_challenge(
    ClientId='string',
    ChallengeName='SMS_MFA'|'EMAIL_OTP'|'SOFTWARE_TOKEN_MFA'|'SELECT_MFA_TYPE'|'MFA_SETUP'|'PASSWORD_VERIFIER'|'CUSTOM_CHALLENGE'|'SELECT_CHALLENGE'|'DEVICE_SRP_AUTH'|'DEVICE_PASSWORD_VERIFIER'|'ADMIN_NO_SRP_AUTH'|'NEW_PASSWORD_REQUIRED'|'SMS_OTP'|'PASSWORD'|'WEB_AUTHN'|'PASSWORD_SRP',
    Session='string',
    ChallengeResponses={
        'string': 'string'
    },
    AnalyticsMetadata={
        'AnalyticsEndpointId': 'string'
    },
    UserContextData={
        'IpAddress': 'string',
        'EncodedData': 'string'
    },
    ClientMetadata={
        'string': 'string'
    }
)
Parameters:

  • ClientId (string) –

    [REQUIRED]

    The app client ID.

  • ChallengeName (string) –

    [REQUIRED]

    The challenge name. For more information, see InitiateAuth.

    ADMIN_NO_SRP_AUTH isn’t a valid value.

  • Session (string) – The session that should be passed both ways in challenge-response calls to the service. If InitiateAuth or RespondToAuthChallenge API call determines that the caller must pass another challenge, they return a session with other challenge parameters. This session should be passed as it is to the next RespondToAuthChallenge API call.

  • ChallengeResponses (dict) –

    The responses to the challenge that you received in the previous request. Each challenge has its own required response parameters. The following examples are partial JSON request bodies that highlight challenge-response parameters.

    Warning

    You must provide a SECRET_HASH parameter in all challenge responses to an app client that has a client secret. Include a DEVICE_KEY for device authentication.

    SELECT_CHALLENGE

    "ChallengeName": "SELECT_CHALLENGE", "ChallengeResponses": { "USERNAME": "[username]", "ANSWER": "[Challenge name]"}

    Available challenges are PASSWORD, PASSWORD_SRP, EMAIL_OTP, SMS_OTP, and WEB_AUTHN.

    Complete authentication in the SELECT_CHALLENGE response for PASSWORD, PASSWORD_SRP, and WEB_AUTHN:

    • "ChallengeName": "SELECT_CHALLENGE", "ChallengeResponses": { "ANSWER": "WEB_AUTHN", "USERNAME": "[username]", "CREDENTIAL": "[AuthenticationResponseJSON]"} See AuthenticationResponseJSON.

    • "ChallengeName": "SELECT_CHALLENGE", "ChallengeResponses": { "ANSWER": "PASSWORD", "USERNAME": "[username]", "PASSWORD": "[password]"}

    • "ChallengeName": "SELECT_CHALLENGE", "ChallengeResponses": { "ANSWER": "PASSWORD_SRP", "USERNAME": "[username]", "SRP_A": "[SRP_A]"}

    For SMS_OTP and EMAIL_OTP, respond with the username and answer. Your user pool will send a code for the user to submit in the next challenge response.

    • "ChallengeName": "SELECT_CHALLENGE", "ChallengeResponses": { "ANSWER": "SMS_OTP", "USERNAME": "[username]"}

    • "ChallengeName": "SELECT_CHALLENGE", "ChallengeResponses": { "ANSWER": "EMAIL_OTP", "USERNAME": "[username]"}

      SMS_OTP

    "ChallengeName": "SMS_OTP", "ChallengeResponses": {"SMS_OTP_CODE": "[code]", "USERNAME": "[username]"}

    EMAIL_OTP

    "ChallengeName": "EMAIL_OTP", "ChallengeResponses": {"EMAIL_OTP_CODE": "[code]", "USERNAME": "[username]"}

    SMS_MFA

    "ChallengeName": "SMS_MFA", "ChallengeResponses": {"SMS_MFA_CODE": "[code]", "USERNAME": "[username]"}

    PASSWORD_VERIFIER

    This challenge response is part of the SRP flow. Amazon Cognito requires that your application respond to this challenge within a few seconds. When the response time exceeds this period, your user pool returns a NotAuthorizedException error.

    "ChallengeName": "PASSWORD_VERIFIER", "ChallengeResponses": {"PASSWORD_CLAIM_SIGNATURE": "[claim_signature]", "PASSWORD_CLAIM_SECRET_BLOCK": "[secret_block]", "TIMESTAMP": [timestamp], "USERNAME": "[username]"}

    Add "DEVICE_KEY" when you sign in with a remembered device.

    CUSTOM_CHALLENGE

    "ChallengeName": "CUSTOM_CHALLENGE", "ChallengeResponses": {"USERNAME": "[username]", "ANSWER": "[challenge_answer]"}

    Add "DEVICE_KEY" when you sign in with a remembered device.

    NEW_PASSWORD_REQUIRED

    "ChallengeName": "NEW_PASSWORD_REQUIRED", "ChallengeResponses": {"NEW_PASSWORD": "[new_password]", "USERNAME": "[username]"}

    To set any required attributes that InitiateAuth returned in an requiredAttributes parameter, add "userAttributes.[attribute_name]": "[attribute_value]". This parameter can also set values for writable attributes that aren’t required by your user pool.

    Note

    In a NEW_PASSWORD_REQUIRED challenge response, you can’t modify a required attribute that already has a value. In RespondToAuthChallenge, set a value for any keys that Amazon Cognito returned in the requiredAttributes parameter, then use the UpdateUserAttributes API operation to modify the value of any additional attributes.

    SOFTWARE_TOKEN_MFA

    "ChallengeName": "SOFTWARE_TOKEN_MFA", "ChallengeResponses": {"USERNAME": "[username]", "SOFTWARE_TOKEN_MFA_CODE": [authenticator_code]}

    DEVICE_SRP_AUTH

    "ChallengeName": "DEVICE_SRP_AUTH", "ChallengeResponses": {"USERNAME": "[username]", "DEVICE_KEY": "[device_key]", "SRP_A": "[srp_a]"}

    DEVICE_PASSWORD_VERIFIER

    "ChallengeName": "DEVICE_PASSWORD_VERIFIER", "ChallengeResponses": {"DEVICE_KEY": "[device_key]", "PASSWORD_CLAIM_SIGNATURE": "[claim_signature]", "PASSWORD_CLAIM_SECRET_BLOCK": "[secret_block]", "TIMESTAMP": [timestamp], "USERNAME": "[username]"}

    MFA_SETUP

    "ChallengeName": "MFA_SETUP", "ChallengeResponses": {"USERNAME": "[username]"}, "SESSION": "[Session ID from VerifySoftwareToken]"

    SELECT_MFA_TYPE

    "ChallengeName": "SELECT_MFA_TYPE", "ChallengeResponses": {"USERNAME": "[username]", "ANSWER": "[SMS_MFA or SOFTWARE_TOKEN_MFA]"}

    For more information about SECRET_HASH, see Computing secret hash values. For information about DEVICE_KEY, see Working with user devices in your user pool.

    • (string) –

      • (string) –

  • AnalyticsMetadata (dict) –

    The Amazon Pinpoint analytics metadata that contributes to your metrics for RespondToAuthChallenge calls.

    • AnalyticsEndpointId (string) –

      The endpoint ID. Information that you want to pass to Amazon Pinpoint about where to send notifications.

  • UserContextData (dict) –

    Contextual data about your user session, such as the device fingerprint, IP address, or location. Amazon Cognito advanced security evaluates the risk of an authentication event based on the context that your app generates and passes to Amazon Cognito when it makes API requests.

    For more information, see Collecting data for threat protection in applications.

    • IpAddress (string) –

      The source IP address of your user’s device.

    • EncodedData (string) –

      Encoded device-fingerprint details that your app collected with the Amazon Cognito context data collection library. For more information, see Adding user device and session data to API requests.

  • ClientMetadata (dict) –

    A map of custom key-value pairs that you can provide as input for any custom workflows that this action triggers.

    You create custom workflows by assigning Lambda functions to user pool triggers. When you use the RespondToAuthChallenge API action, Amazon Cognito invokes any functions that are assigned to the following triggers: post authentication, pre token generation, define auth challenge, create auth challenge, and verify auth challenge. When Amazon Cognito invokes any of these functions, it passes a JSON payload, which the function receives as input. This payload contains a clientMetadata attribute, which provides the data that you assigned to the ClientMetadata parameter in your RespondToAuthChallenge request. In your function code in Lambda, you can process the clientMetadata value to enhance your workflow for your specific needs.

    For more information, see Customizing user pool Workflows with Lambda Triggers in the Amazon Cognito Developer Guide.

    Note

    When you use the ClientMetadata parameter, note that Amazon Cognito won’t do the following:

    • Store the ClientMetadata value. This data is available only to Lambda triggers that are assigned to a user pool to support custom workflows. If your user pool configuration doesn’t include triggers, the ClientMetadata parameter serves no purpose.

    • Validate the ClientMetadata value.

    • Encrypt the ClientMetadata value. Don’t send sensitive information in this parameter.

    • (string) –

      • (string) –

Return type:

dict

Returns:

Response Syntax

{
    'ChallengeName': 'SMS_MFA'|'EMAIL_OTP'|'SOFTWARE_TOKEN_MFA'|'SELECT_MFA_TYPE'|'MFA_SETUP'|'PASSWORD_VERIFIER'|'CUSTOM_CHALLENGE'|'SELECT_CHALLENGE'|'DEVICE_SRP_AUTH'|'DEVICE_PASSWORD_VERIFIER'|'ADMIN_NO_SRP_AUTH'|'NEW_PASSWORD_REQUIRED'|'SMS_OTP'|'PASSWORD'|'WEB_AUTHN'|'PASSWORD_SRP',
    'Session': 'string',
    'ChallengeParameters': {
        'string': 'string'
    },
    'AuthenticationResult': {
        'AccessToken': 'string',
        'ExpiresIn': 123,
        'TokenType': 'string',
        'RefreshToken': 'string',
        'IdToken': 'string',
        'NewDeviceMetadata': {
            'DeviceKey': 'string',
            'DeviceGroupKey': 'string'
        }
    }
}

Response Structure

  • (dict) –

    The response to respond to the authentication challenge.

    • ChallengeName (string) –

      The challenge name. For more information, see InitiateAuth.

    • Session (string) –

      The session that should be passed both ways in challenge-response calls to the service. If the caller must pass another challenge, they return a session with other challenge parameters. This session should be passed as it is to the next RespondToAuthChallenge API call.

    • ChallengeParameters (dict) –

      The challenge parameters. For more information, see InitiateAuth.

      • (string) –

        • (string) –

    • AuthenticationResult (dict) –

      The result returned by the server in response to the request to respond to the authentication challenge.

      • AccessToken (string) –

        Your user’s access token.

      • ExpiresIn (integer) –

        The expiration period of the authentication result in seconds.

      • TokenType (string) –

        The intended use of the token, for example Bearer.

      • RefreshToken (string) –

        Your user’s refresh token.

      • IdToken (string) –

        Your user’s ID token.

      • NewDeviceMetadata (dict) –

        The new device metadata from an authentication result.

        • DeviceKey (string) –

          The device key, an identifier used in generating the DEVICE_PASSWORD_VERIFIER for device SRP authentication.

        • DeviceGroupKey (string) –

          The device group key, an identifier used in generating the DEVICE_PASSWORD_VERIFIER for device SRP authentication.

Exceptions